Theorists in astrophysics endeavor to create the simplest models possible that are in agreement with observations (from astronomers). Their models/theories must make testable predictions. New data can then be gathered which may be consistent or inconsistent with the theory; in the case of an inconsistency, the model may be discarded or (as is often the case) new complications are added to it.
Topics studied by theoretical astrophysics include: stellar dynamics[?] and evolution; galaxy formation; large-scale structure of matter in the Universe; origin of cosmic rays; and cosmology.
Some widely-accepted theories/models in astrophysics include the Big Bang, Cosmic inflation, dark matter, and fundamental theories of physics. For an example of an astrophysical theory (although one which is not generally accepted by the astrophysical community), see the article Modified Newtonian Dynamics.
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